Oxidation Reaction of Sulphur
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Questions and Answers

What is the result of the reaction between concentrated sulphuric(VI) acid and charcoal?

  • Production of carbon(IV)oxide (correct)
  • Production of sulphur(IV)oxide
  • Production of nitric(V) acid
  • Production of hydrochloric acid

    • What is the effect of diluting concentrated sulphuric(VI) acid?

  • Increase in the number of moles present in a given volume of solution
  • Production of nitric(V) acid
  • Decrease in the number of moles present in a given volume of solution (correct)
  • Production of sulphur(IV)oxide

    • What is the purpose of adding acidified potassium dichromate(VI) solution to the filter paper?

  • To test for the presence of hydrochloric acid
  • To test for the presence of nitric(V) acid
  • To test for the presence of charcoal
  • To test for the presence of sulphur(IV)oxide (correct)

    • What is the type of reaction involved in the displacement of nitric(V) acid from its salt?

    <p>Displacement reaction</p> Signup and view all the answers

    What is the role of concentrated sulphuric(VI) acid in the preparation of nitric(V) acid?

    <p>As a reactant</p> Signup and view all the answers

    What is the effect of adding water to concentrated sulphuric(VI) acid?

    <p>The acid becomes less corrosive</p> Signup and view all the answers

    What is the purpose of using acidified potassium dichromate(VI) solution?

    <p>To test for the presence of sulphur(IV)oxide</p> Signup and view all the answers

    What is the result of the reaction between concentrated sulphuric(VI) acid and sulphur?

    <p>Production of sulphur(IV)oxide</p> Signup and view all the answers

    What happens when hydrogen sulphide gas is passed through acidified potassium dichromate(VI) solution?

    <p>The solution turns green</p> Signup and view all the answers

    What is the byproduct of the reaction between hydrogen sulphide gas and acidified potassium dichromate(VI) solution?

    <p>Yellow solid residue</p> Signup and view all the answers

    What is the purpose of using acidified potassium dichromate(VI) solution in a chemical test?

    <p>To detect the presence of hydrogen sulphide gas</p> Signup and view all the answers

    What happens when hydrogen sulphide gas is passed through acidified potassium manganate(VII) solution?

    <p>The solution turns colourless</p> Signup and view all the answers

    What is the byproduct of the reaction between hydrogen sulphide gas and acidified potassium manganate(VII) solution?

    <p>Yellow solid residue</p> Signup and view all the answers

    What is the purpose of using acidified potassium manganate(VII) solution in a chemical test?

    <p>To detect the presence of hydrogen sulphide gas</p> Signup and view all the answers

    What happens when hydrogen sulphide gas is passed through bromine water?

    <p>The solution turns colourless</p> Signup and view all the answers

    What is the byproduct of the reaction between hydrogen sulphide gas and bromine water?

    <p>Yellow solid residue</p> Signup and view all the answers

    What is the result of the reaction between ZnCO3 and H2SO4?

    <p>ZnSO4 and H2O and CO2</p> Signup and view all the answers

    Which of the following oxides forms a blue solution when reacted with dilute sulphuric acid?

    <p>CuO</p> Signup and view all the answers

    What is the product of the reaction between ZnO and H2SO4?

    <p>ZnSO4 and H2O</p> Signup and view all the answers

    What is the result of the reaction between Na2O and H2SO4?

    <p>Na2SO4 and H2O</p> Signup and view all the answers

    What is the common product of the reaction between a metal oxide and dilute sulphuric acid?

    <p>H2O</p> Signup and view all the answers

    Why do the reactions of calcium, lead and barium carbonates with dilute sulphuric acid stop after a while?

    <p>Because the sulphate salts formed coat the unreacted metal</p> Signup and view all the answers

    What is the product of the reaction between 2NaOH and H2SO4?

    <p>Na2SO4 and H2O</p> Signup and view all the answers

    Where does hydrogen sulphide occur naturally?

    <p>In volcanic areas</p> Signup and view all the answers

    What is the product of the reaction between Mg(s) and H2SO4(aq)?

    <p>MgSO4(aq) + H2(g)</p> Signup and view all the answers

    Which metal reacts explosively with dilute sulphuric acid?

    <p>Sodium</p> Signup and view all the answers

    What happens when a metal carbonate or hydrogen carbonate is added to dilute sulphuric acid?

    <p>A sulphate salt is formed with the evolution of carbon dioxide gas</p> Signup and view all the answers

    What is the colour of the solution formed when Iron(II)Carbonate is added to dilute sulphuric acid?

    <p>Green</p> Signup and view all the answers

    What is the product of the reaction between Zn(s) and H2SO4(aq)?

    <p>ZnSO4(aq) + H2(g)</p> Signup and view all the answers

    What is the purpose of introducing a burning splint on top of the boiling tube?

    <p>To test if the gas produced is flammable</p> Signup and view all the answers

    What is the characteristic of the gas produced when a metal carbonate or hydrogen carbonate is added to dilute sulphuric acid?

    <p>It is colourless and extinguishes a burning splint</p> Signup and view all the answers

    What is formed when carbon dioxide gas is bubbled in lime water?

    <p>A white precipitate</p> Signup and view all the answers

    What is the product formed when Pb+(aq) reacts with H2S?

    <p>PbS</p> Signup and view all the answers

    What is the colour of the precipitate formed when Cu2+(aq) reacts with H2S?

    <p>Black</p> Signup and view all the answers

    What is formed when H2S(g) reacts with NaOH(l) in equimolar concentrations?

    <p>NaHS</p> Signup and view all the answers

    What is the purpose of adding nitric(V) acid in the test for sulphates and sulphites?

    <p>To distinguish between SO42- and SO32- ions</p> Signup and view all the answers

    What is the observation when the preserved sample is heated to boil?

    <p>The precipitate persists</p> Signup and view all the answers

    What is the purpose of adding acidified potassium manganate(VII) to the preserved sample?

    <p>To distinguish between SO42- and Cl- ions</p> Signup and view all the answers

    What is the observation when acidified potassium manganate(VII) is added to the preserved sample?

    <p>The precipitate dissolves</p> Signup and view all the answers

    What is the final inference if the white precipitate persists on boiling?

    <p>Presence of SO42- ions</p> Signup and view all the answers

    Study Notes

    Reaction between Sulphuric Acid and Metals

    • Sulphuric acid oxidizes non-metals to non-metallic oxides and reduces itself to sulphur(IV)oxide gas
    • Charcoal is oxidized to carbon(IV)oxide, and sulphur is oxidized to sulphur(IV)oxide
    • Chemical equation: C(s) + 2H2SO4(aq) --> CO2(aq) + 2SO2(g) + 2H2O(l)
    • S(s) + 2H2SO4(aq) --> 3SO2(g) + 2H2O(l)

    Displacement of Less Volatile Acids

    • Concentrated sulphuric acid displaces more volatile acids from their salts
    • Chemical equation: KNO3(s) + H2SO4(aq) --> KHSO4(l) + HNO3(g)
    • Chemical equation: KCl(s) + H2SO4(aq) --> KHSO4(s) + HCl(g)

    Properties of Dilute Sulphuric Acid

    • Dilute sulphuric acid is made by adding concentrated sulphuric acid to distilled water
    • Diluting concentrated sulphuric acid decreases the number of moles present in a given volume of solution, making the acid less corrosive
    • Chemical equations:
      • Mg(s) + H2SO4(aq) --> MgSO4(aq) + H2(g)
      • Zn(s) + H2SO4(aq) --> ZnSO4(aq) + H2(g)
      • Fe(s) + H2SO4(aq) --> FeSO4(aq) + H2(g)

    Reaction with Metal Carbonates and Hydrogen Carbonates

    • Effervescence occurs when a metal carbonate or hydrogen carbonate is added to dilute sulphuric acid
    • Carbon(IV)oxide gas is produced, which extinguishes a burning splint and forms a white precipitate when bubbled in lime water
    • Chemical equations:
      • ZnCO3(s) + H2SO4(aq) --> ZnSO4(aq) + H2O(l) + CO2(g)
      • CuCO3(s) + H2SO4(aq) --> CuSO4(aq) + H2O(l) + CO2(g)
      • FeCO3(s) + H2SO4(aq) --> FeSO4(aq) + H2O(l) + CO2(g)
      • 2NaHCO3(s) + H2SO4(aq) --> Na2SO4(aq) + 2H2O(l) + 2CO2(g)

    Reaction with Metal Oxides and Hydroxides

    • Metal oxides react with dilute sulphuric acid to form a salt and water
    • Chemical equations:
      • ZnO(s) + H2SO4(aq) --> ZnSO4(aq) + H2O(l)
      • CuO(s) + H2SO4(aq) --> CuSO4(aq) + H2O(l)
      • MgO(s) + H2SO4(aq) --> MgSO4(aq) + H2O(l)
      • Na2O(s) + H2SO4(aq) --> Na2SO4(aq) + H2O(l)

    Reaction with Hydrogen Sulphide

    • Hydrogen sulphide gas reduces acidified potassium dichromate(VI) from orange Cr2O72- ions to green Cr3+ ions
    • Hydrogen sulphide gas decolorizes acidified purple potassium manganate(VII) solution
    • Hydrogen sulphide gas reduces red-brown bromine water to colourless hydrobromic acid (HBr)

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    Description

    This quiz is about the oxidation reaction of sulphur with concentrated sulphuric acid, producing sulphur dioxide gas and its characteristics.

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